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Local Electric Field Gradients in Anionic and Cationic Positions of Cesium Perchlorate
Author(s) -
Tarasov V. P.,
Meladze M. A.,
Kirakosyan G. A.,
Shvelashvili A. E.,
Buslaev Yu. A.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221670129
Subject(s) - electric field gradient , quadrupole , thermal expansion , anisotropy , tensor (intrinsic definition) , coupling constant , electric field , asymmetry , chemistry , field (mathematics) , atmospheric temperature range , caesium , cationic polymerization , perchlorate , analytical chemistry (journal) , atomic physics , physics , ion , thermodynamics , inorganic chemistry , optics , mathematics , organic chemistry , particle physics , quantum mechanics , chromatography , pure mathematics
Polycrystalline CsClO 4 is studied over the range from 95 to 440 K by 35 Cl and 133 Cs NMR in the field B 0 = 7.04 T. From the analysis of the lineshape the quadrupole coupling constant C Q and the asymmetry parameter η at the nuclei 35 Cl and 133 Cs are determined. The temperature dependence of C Q is linear for both the nuclei with a negative temperature coefficient. A sharp break of η( 133 Cs) at 342K is due to the change in the relative values of the tensor components qij of the electric field gradient on 133 Cs. The temperature dependence of qij is considered in relation to the anisotropy of the thermal expansion and a numerical evaluation of the thermal expansion coefficient is made.